Stop-motion gearing



" (No Model.)

S. D. LOOKE.

STOP MOTION GEARING. No. 316,797. Patented Apr. 28, 1885.

FIG; 1.

I I S s i v w I as' ylvunzw fllloc' e NlT-ED STATES PATENT OFFICE.

SYLVANUS D. LOGKE, OF HOOSIG FALLS, NEXV YORK.

STOP-MOTION GEARING.

SPECIFICATION forming part of Letters Patent No. 316,797, dated April28, 1885.

Application filed May 10, 1884.

To all whom it may concern.-

Be it known that I, SYLVANUS D. LooKE, of Hoosic Falls, in the county ofReusselaer and State of New York, have invented certain new and usefulImprovements in Stop-Motion Gearing, of which the following isaspecification.

My improvement relates to gearing einployed in machines where itisdesirable to intermittently stop and hold the shaft upon which thedriven gear is mounted, together with its attachments, or its ensuingtrain of mechanism or the tool which it drives, in a fixed and steadyposition, while the drivingshaft continues to revolve. To this end Ihavedevised the mechanism hereinafter described, in which stop-motionbevelgearing of peculiar construction is interposed between the drivingand driven shafts.

In the drawings, Figure 1 is a view ofa pair of intermeshing bevel-gearsand their respective shafts embodying my improvements, the driving gearbeing shown in plan and the driven gear edgewise. Fig. 2 is a sideelevation of the mechanism shown in the preceding figure, with the gearsin the same relation to each other. Fig. 3 is a back, and Fig. 4 a face,view of the driven gear.

A represents a post or standard,which, for convenience of description,will be supposed to be upright and to constitute part of any suitableframe. This standard supports the vertical drivingshaft A, constantlydriven from any proper source.

B is a brace extending from the standard tosupport a sleeve or bracket,0, in which is journaled the shaft 0, carrying at its farther end acrank or other instrumentality by which is driven the tool or effectiveagent which it is desired to control. At the top of the verticalstandard and borne by its inclosed shaft is a beveled gear, D, having ablank space or mutilation, d, of length corresponding to the interval ofdelay required by the function of the machine. Opposite to said blankspace and circumscribed about it on a longer radius is the concentricflange d, cast integral with or firmly secured to the bevel gear, andcommencing a little in advance of the yielding or departing end of saidblank space. This flange at its advancing or leading end is inclined, asat d, and at the top of the incline, which is (No model.)

nearly or quite on a level with the highest crests of the gear-teeth,becomes and c0ntinues to be a plane surface to its farther end, whichnearly coincides with the farther end of the blank space.

Arranged upon the adjacentend of the driven shaft,in position tointermesh with the driv ing-gear just described, is a second gear, E, ofsuch relative size as to communicate the desired speed when driven bythe former. This driven gear has a blank space, e, which once in eachrevolution is brought opposite to the blank space in the driving-gear,to cause the driven shaft to stop; but this alone is not sufficient tosecure a positive positioning and holding of the ensuing train, tool, oreffective agency. Therefore I provide the driven gear with a lug oroffset, 6, carrying an anti-friction roller, 6 at some distance from theaxis or shaft, and preferably set outbeyond the periphery of the gearitself to give greater leverage and a firmer bearing. This roller willhave its axis within, or practically within, a plane lengthwise of andradial to the'drivingshaft, but may be at any suitable inclinationwithin that plane, and is so arranged upon the gear that while said gearis still in mesh with the driving-gear, but approaching the point atwhich it passes out of mesh, the rollstrikes the foot of the incline d,and rides up said incline concurrently with the revolution of the gearuntil 3 ust as it reaches or is on the point of reaching. the top of theincline and entering upon the plane surface of the ledge the blankspaces of the two gears match and the engagement of their teeth ceases.Thereafter, while these blank spaces continue to match and while theroller is traveling over that part of the ledge corresponding with thepas sage of the blank spaces past each other, the driven mechanism oreffective agent will be held steadily against any yielding or retrogrademotion which the resistance of the material being operated upon willtend to cause.

In order atthe same time to prevent onward motion of the effectiveagent, a shoe or runner, e, is fixed to the driven gear or to its hub,or the side opposite to the roller, andin such position that as theroller meshes and rides upon the plane surface of the flange this shoealso comes upon the flange, lying flat thereon and sliding along itslength. In this manner a broad bearing is obtained, consisting of theroller and of the shoe, and the effective agent is brought more forciblyand more steadily to its position of rest by the extended leverage givenby the roller and the incline of the delay-flange, which, as abovestated, is set out from the driving-gear at a longer radius than theteeth of said gear. This is a marked advantage, since where the teethalone are relied upon to drive the tool or other mechanism to a certainposition the wearing of the teeth is very apt to change or modify thisposition. The anti-friction roll and the ledge avoid the effect of thewear and secure more certain and easier work, as roll and ledge are veryeasily carried out much farther from the center of the shaft than thegear-teeth can possibly be.

In stop-motions as heretofore used the leading end of the shoe wouldeventually wear down under constant usage, so as to leave the tool oreffective agent a little loose or out of position with reference to itsworking-point at the moment of delay; but by the use of theanti-friction roll with the flange or ledge described the wearing downof the forward outer end of a solid shoe is entirely avoided, and at thesame time a more extended or broader bearingcontact of the driven gearupon the flange of the drivinggear is secured.

It is not absolutely essential that both gears should be mutilated inall cases, as there are.

well-known conditions in which the driving and driven gears and theirdescribed accessories would work properly if only the driver weremutilated or had a blank or cut-away space; nor is the forward shoe orrunner essential in cases where the forces exerted on the driven gear orresisting its motion tend to hold the anti-friction roller down inposition on the flange or trackway on which it runs. A. secondanti-friction roller may be substituted for the shoe or runner 6, thusobtaining all the avantages'of the broad and steady hearing alreadystated, with diminished wear and friction.

While I have referred to the outside ledge upon the driving-gear,asdescribed,in a plane from the head of the leading incline, it is evidentthat it may have any conformation necessary to give any desired movementof the tool or effective device other than that derived from theintermeshing of the gear-teeth. For instance, a secondary incline may beused to give the tool an additional forward movement, or a dropping orrecession of the ledge will allow the tool to fall back or yield.

1. A driving bevel-gear void of teeth for a definite interval and havinga concentric flange arranged abreast said interval, in combination witha driven gear provided with an anti-friction roll pivoted on a stud setout from the periphery of said driven gear and adapted to ride orrevolve along the flange of said drivinggear, substantially in themanner described, and for the purpose set forth.

2. The combination, with a driving bevelgear having a blank space ordefinite dental interval and a concentric ledge or flange pro vided withan incline at its advancing end, of adriven bevel gear arranged to meshwith the other and having a roll set out from its periphery to strikeand be lifted by said incline and travel along the ledge.

3. The combination, with the driving bevelgear having a blank space,concentric flange, and incline, as set forth, of the driven bevelgearhaving an anti-friction roll set out from its periphery on one side ofits hub andashoe on the other.

SYLVANUS D. LOOKE.

\Vi tnesses:

N. CALLAN, J osEPH G. PARKINSON.

